Mercury MerCruiser Quicksilver Impeller 89984T4
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Mercury MerCruiser / Quicksilver Impeller – 89984T4
Maintain proper engine cooling and prevent overheating with the genuine Mercury Marine / Quicksilver 89984T4 Water Pump Impeller. This OEM impeller circulates raw water through the cooling system, ensuring consistent water flow to maintain optimal engine operating temperatures.
Manufactured to Mercury Marine’s original equipment specifications, the impeller features durable neoprene rubber vanes with a metal hub insert, designed to withstand the demanding conditions of marine cooling systems.
Key Features
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Genuine Mercury / Quicksilver OEM water pump impeller
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Restores proper raw-water cooling flow through the engine
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Flexible neoprene rubber vanes with metal hub for durability
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Helps prevent engine overheating and cooling system failure
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Designed for direct replacement in Mercury and MerCruiser water pumps
Replaces / Cross Reference
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Mercury 47-89984T4
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47-89984T3
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47-803631T
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47-8M0028376
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Sierra 18-3017
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Mallory 9-45306
Compatible Mercury / MerCruiser Engines
Commonly used on a wide range of Mercury outboards and MerCruiser sterndrives, including:
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Mercury / Mariner outboards: approximately 30–300 HP (various 2-stroke models)
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MerCruiser sterndrives: MC-I, R, MR, and Alpha One (Gen I) drives
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Certain V6 Mercury outboards and Force engines depending on configuration.
Service Recommendation
Water pump impellers are wear items and should typically be inspected annually and replaced every 100 hours or once per season to maintain reliable cooling performance.
Important Compatibility Note
Impeller fitment can vary by engine model, gearcase type, and serial number range. Always verify compatibility using the engine serial number or existing part number to ensure the correct replacement.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.